Improvement in spark-arresters



D. B. DENNISON.

Spark-Arresters.

No. 134,261. Patented Dec. 24, 1872.

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1- 3'- muhll Attorneys.

AM PHOTO'LITHOGRAPHIL C0 MY/USEOIINES PROCESS.)

UNITED STATES PATENT OFFICE.

DAVID DENNISON, OF OT'IUMVVA, IOWA.

IMPROVEMENT IN SPARK-ARRESTERS.

I Specification forming part of Letters Patent No. 134,261, datedDecember 24, 1872.

To all whom it may concern.-

Be it known that 1, DAVID B. DENNISON, of Ottumwa, in the county ofWapello and in the State of Iowa, have invented certain new and usefulImprovements in Smoke-Stacks; and do hereby declare that the followingis a full, clear, and exact description thereof, reference being had tothe accompanying drawing and to the letters of reference marked thereonmaking a part of this specification.

The ordinary spark-arrester for smoke-stacks of coal-burning locomotivesconsists of a single cone about sixteen inches at the top, which runsdown about the same distance to a point. This throws the sparks in acircle, cutting the netting and stack out in a very short time. Toobviate this difficulty is the object of my invention; and it consistsin a series of flaring rings placed concentrically within each other,and a grate elevated a suitable distance above the same, as will behereinafter more fully set forth.

In order to enable others skilled in the art to which my inventionappertains to make and use the same, I will now proceed to describe itsconstruction and operation, referring to the annexed drawing, in which-Figure 1 is a vertical section of a smokestack with my spark-arresterattached within the same; Fig. 2 is a perspective view of the series ofconcentric flaring rings; and Fig. 3 is a plan view of the stack withspark-arrester.

A represents an ordinary smoke-stack for locomotives, provided on theinside with four vertical screw-bolts, B B, to receive thesparkarrester. rings placed concentrically within each other, andconnected by ribs a a. On the exterior of the outer ring (3 are formedfour sleeves or tubes, b b, to fit on the screw-bolts B B, and held'atany desired height on the same by means of nuts d (1. Above the rings 0G is placed a grate, D, adjusted upon the bolts B B by nuts 0 e. Theseries of concentric and flaring rings 0 0 will distribute the sparksand exhaust steam evenly over the whole surface of 'the grate D, thusgiving better draf and wearing out the grate evenly.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is-

The combination, with a smoke-stack, A, of the series of concentricflaring rings 0 G and the grate D, all substantially as set forth.

In testimony that I claim the foregoing I hay e hereunto set my handthis 16th day of October, 1872.

CYRUS B. LEwIs, S. D. PIERCE.

O 0 represent a series of flaring

